How do I appeal their decision to close the case and how do I do that?

There was a child molestation case against my husband. The police wanted to charge him with 1 count of sexual battery and 3 counts of lewd and lascivious behavior. My 14 year old daughter was sent a subpoena and went to the district attorney. Two weeks later, we received a letter stating they were not going to file charges and the case was being denied. How do I find an attorney to talk to help me through this process? I am aware the DA is supposed to be her attorney if charges were filed but I need an attorney to ask questions in this matter.